• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.359-362
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• 2021

자기 주권 신원 증명 기술인 DID가 강력한 인증 수단으로 떠오르고 있다. 이런 DID 기술을 사용한 DIDComm은 중앙을 거치지 않는, 사용자끼리의 통신(P2P)을 가능하게 만들어 주며, 이는 강력한 보안을 제공해 준다. 본 글은 DIDComm 기술을 활용한 P2P 메신저에 대해 작성하였다. 이를 활용한 메신저는 사용자 간의 높은 보안을 가진 통신을 제공해 줄 수 있으며 앞으로의 인터넷 시대, 메타버스 시대에서 주목할 만한 기술이다.

• International Journal of Internet, Broadcasting and Communication
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• v.13 no.2
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• pp.60-66
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• 2021

Blockchain is a technology that enables trust-based consensus and verification based on a decentralized network. Distributed ID (DID) is based on a decentralized structure, and users have the right to manage their own ID. Recently, interest in self-sovereign identity authentication is increasing. In this paper, as a method for transparent and safe sovereignty management of data, among data pseudonymization techniques for blockchain use, various methods for data encryption processing are examined. The public key technique (homomorphic encryption) has high flexibility and security because different algorithms are applied to the entire sentence for encryption and decryption. As a result, the computational efficiency decreases. The hash function method (MD5) can maintain flexibility and is higher than the security-related two-way encryption method, but there is a threat of collision. Zero-knowledge proof is based on public key encryption based on a mutual proof method, and complex formulas are applied to processes such as personal identification, key distribution, and digital signature. It requires consensus and verification process, so the operation efficiency is lowered to the level of O (log_eN) ~ O(N²). In this paper, data encryption processing for blockchain DID, based on zero-knowledge proof, was proposed and a one-way encryption method considering data use range and frequency of use was proposed. Based on the content presented in the thesis, it is possible to process corrected zero-knowledge proof and to process data efficiently.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.05a
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• pp.217-220
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• 2022

디지털 전환 시대를 맞아 일상생활 대부분이 온라인으로 이동하면서 온라인상에서 자신을 나타내는 신뢰할 수 있는 신분증의 필요성이 커지게 되었다. 신원 확인 방법은 중앙 집중식 모델에서 현재는 자기주권신원 모델로 변화하는 과정에 있으며 사용되는 핵심 기술은 탈중앙 식별자 DID(Decentralized Identifier)이다. DID는 기존 신원 체계와 달리 개인의 데이터 소유권을 개인에게 돌려줘 데이터 주권을 지킬 수 있게 해줌으로써 개인의 정보 공유 범위를 결정하는 SSI(Self Sovereign Identity)를 실현하는 기술이다. DID를 이용하면 데이터의 무결성, 투명성을 보장하는 자격 증명(Verifiable Credential, Verifiable Presentation) 발급이 가능하며 이를 검증하는 데이터는 모두 블록체인에 올라가 있는 것이 특징이다. 본 논문에서는 실제 서비스와 유사한 시뮬레이션 환경을 구축하여 자격 증명의 사용자 프라이버시를 보호하는 방법인 BBS+서명 기법에 대해 알아보고자 한다.

• Journal of Korean Philosophical Society
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• v.137
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• pp.249-276
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• 2016

The thought of Emmanuel Mounier addresses the most important problems in human life. In this research we try to analyze the three ontological characteristics of 'Person'. First the person has an indefinable character and is not substitutable since he is the true self which is the inner and spiritual being constituting the self-consciousness of an individual. The person has his individuality precisely because he is an individual and his being sovereign in having his own world. Next, the person's individuality has an ontological solitude from his own perspective. Nevertheless, having essentially an existential openness since it receives the elements that compose his own world by relationship and communication between men, and being connected unremittedly, the person is paradoxical. Finally, the person appears as a dynamic thing that continues to create the new self-consciousness. And this dynamism of the person wants to proclaim its self identity while at the same time, aim for a "personification of society" based on the love of humanity. Because of this we can say that the thought of Emmanuel Mounier on the person may be a new type of "humanism" that can give light to the misery of modern society.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.3
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• pp.513-525
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• 2020

Until today, the personal information of subjects has been centralized in many companies or institutions. However, in recent days, the paradigm has gradually changed in the direction that subjects control their personal information and persue their self-sovereignty. Globally, individual data sovereignty is strengthened by the European Union's General Data Protection Regulation(GDPR) and the US California Consumer Privacy Act(CCPA). In Korea, a few alliances consist of various companies are creating technology research and service application cases for decentralized ID service model. In this paper, the current decentralized ID service model and its limitations are studied, and a improved decentralized ID service model that can solve them is proposed. The proposed model has a function of securely storing decentralized ID to the third party and a linkage function that can be interoperated even if different decentralized ID services are generated. In addition, a more secure and convenient model by identifying the security threats of the proposed model and deriving the security requirements, is proposed. It is expected that the decentralized ID technology will be applied not only to the proof of people but also to the device ID authentication management of the IoT in the future.

• Korean Journal of Oriental Medicine
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• v.17 no.2
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• pp.1-15
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• 2011

In the latter half of the Joseon(朝鮮) Dynasty, the medical world was encountering a great change. It is said that a large stream between the first half and the latter half of the Joseon Dynasty was a qualitative transition from official relationships to private relationships, that is, from adjustments by governmental power to contractual relationships between individuals. Doctors who can be said to be the core of the medical world became to be left in severer competition. The fact that the number of people engaged in medical practice increased to the extent that doctors had to compete with each other implies that not only demand for medical care was increasing but also that medical care was becoming social service that must be shared by all people in the Joseon Dynasty rather than by small numbers of men of power. Anyway, it seems like that, in the competition that was becoming fiercer, they tried to establish their authority in diverse methods unlike before. As an authority to determine the social positions of doctors in the latter half of the Joseon Dynasty, the government was still occupying an important position, but doctors tried to show off their medical techniques utilizing excellent teachers or books. Meanwhile, they were making efforts to improve treating skills and thereby they were contributing to the development of medical techniques although they were sometimes criticised because of radical treatment or fierce drugs. In this process, it seems like that some doctors made efforts to establish the social meaning of medicine and their identity. In the short dialogue with Hong Yangho(洪良浩), Cho Gwangil(趙光一) was presenting the image of doctors as active and subjective beings. Pointing out the fact that in the society where feudal position systems were still impregnable, even the Confucian scholars who could be considered as a leading group could not but be passive in front of the sovereign power, he emphasized the fact that doctors could practice treatment as they liked. In that he re-discovered the meaning of treating people's diseases as a professional intellectual and that he was forming a subjective sense that medical techniques are active self expression, it can be carefully said that Cho Gwangil was obtaining his identity as a doctor. In the society in the Joseon Dynasty where the position systems were still valid and the value system under Neo-confucianism(性理學) supporting the system was impregnable, this change can be thought to be small yet quite meaningful.